Burglar-alarm relay-drop.



No. 852,226. PATENTED APR. 30, 1907 D:k D FRIEDMAN. BURGLA/RLARM RELAY DROP.

APPLICATION FILED` MAY 17, 1906. y

" myriam? i To uJ/ whoml it may concern,.-

UNITED STATES DAVID D. .FltlEDMANy Specification of' Letters Patent.

PATENT" onirica;

Yor New Yonir, N. Y.

BuRGLAR-ALARM liastAv-insoe.

Patented Aprn :3.0,` 1907.

Application filed May 17,1906. Serin No.`317,389.

Be it known that I, 4DAVID D. 'FuiienuAN a citizen ol the lnitcd States, and a resident ol' tany in'vthe county and State of New York, haveinvented a new and -Improved Burglar- Ahuin Relay-Drop, of which the following is a l'ull, clear, and exact description.

'lhis invention relates to certain improvements in relay drops especially useful in burglarf alarm systems, and relates` more particularly lo a' new and im )roved means whereby the armature 'ofA an `ellectro-iinignet may be locked in position upon the breaking` or closin'gol the circuit.

The device is illustrated in connection with I an vl-)urglar alarm system, and in such it serves :is a relay in closing a second circuit v 'and acts to lock the parts in Contact, whereby after the irst circuitis broken and'the relay o )erated `to ring a bell or give any other suita' ile. alarm the operation of the alarm cannot y lie-'interrupted by restoring the lirst circuit 4to its original.condition.

Referenceis to be had to the accompanying drawings forming a part of this specilication, `in which similar characters of reference indicate` corresponding parts in all the iigures, in which Figure 1 is a transversesection through i my improved relay drop, saidseetion being taken lon' the line 1`-lv of Fig. 2; Fig: 2 is a transverse section-taken on the line 2--2 of Fig. l and Fig. 3 is a diagrammatic illustration of'a system employing my improvcd'device.' v-

`Theoperating parts of my improved device are. preferably supported upon a plate 10 other system may be connected there? at lthe rearofthc plate 10. lSup orted adja cpt the. coils f the magnet is tic armature t A9 ivota-lly connected to a pin and normallyg 'lield eilt-:of engagement with "the coils Vbyf l means of a suitable spring 21A. The arma- I 1 ture 19 carries :i contact spring 22, one end of which is connected to a binding post 23 and the other end of which normally contacts `by the easing and connected toa binding post 25.

Mounted upon the ea `ing through anop'ening therein is a'pin 26 having the inner end thereof normally con-4 tacting with one of the sides of the armature ing and terminating a short distance therefrom, whereby the pin is supported not only in the end of the bracket arm 27 but `alsoA by the wall of the casing. Within the casing and surrounding the pin 26 there is provided .a coil spring 28 normally tending to draw the ment of the inner end of said sidel of the armature;

pin witht The binding posts 17 and ISarendrii-ially is a wire 29 leading to the battery 30, and be# tween said battery and the binding post 18'is ous doors and windows or other pointsat try of a burglar.

be broken whenever desired.

which latter is connected `to the' binding post 23 b v a wire 37 including a switch 3S. the alarm system is set the current generated. in the battery 30 flows continuously throughv` the coils 14 of the electro-magnet and tliear-` .mature is held in engagement with. the ends of the cores oflsaid magnets.

4by the action of the spring 21. The s ring cuit is closodand the bell 36 rung by' the current'generatcd in the l atter \'3-4. As soon as the armature moves awayA l'i'oni the coils of the magnet, the pin 2li is'iinineeliately with an adjustable contact'screw 24 carriedy pin into the casing, but inward movement of thc'pin is normally prevented by the enga e.

arranged awire 31 leading adjacent the vari-' which .the current may be broken by theei? A suitable switch 32 is`p'ro.g". vided in this wire, whereby7 the circuit may:

Connected to the binding post 24 is 'a wird; 38 leading to a battery 34, and from thisbat-.. vtory leads awire to the alarm belljlitn.jv

contact' 22 is forced .into engagement wit the; contact screw 24 and the second oi' alarm clr.-

'ing 12 and extendt 1t). For more firmly support-ing the pin' I I' provide a bracket arm 27 secured to the cas-'fn ".S'. connected to theburglar alarm system, which system is diagrammatically illustrated in Fig. 3.' Leading from the binding post' 17 i As soon as this? i' circuit, hereinafter referred to4 as the pra-."5 tccting circuilz" is broken, the armature'lf is liberated and moves away from .the inagggneti forccdinwxnd due to the action ol' the spring 28 and es this pin posses the side oi the ernia Whenhe hears the alarm bell ring, he cannot by so doing stop said bell. The bell will continue to rinfr even though the protecting cir cuit is closed and cannot .be stopped save by throwing theswitch 38 or by withdrriwiiigthe pin 26, said pin being provided with n suitable handle 39 for accomplishing this purpose.

'It is evident that the protecting circuit may, if desired, be an open one and the pin 26so` located thnt it will be held in place when the armature is sway from' the magnet and drop in place ivlien'the armature. is in Contact therewith. In this oase, the contact 22 would be so constructed that the slerincircuit would he vclosed upon the energizing ot' the magnet rather than upon the cie-energizing thereof. c

Hoving thus described my invention, i

claim as new and desire to secure by' Letters Patent 1. In combination, an eieetroniagnet, an armature adapted to occupy a position either in vcontiict with seid magnetor spaced there from, means for normally holding said armsture in one of seid positions, ond e longitudinally movable pin normally held from moveu ment by seid armature when in the last nien-- tioned position sind adapted to he released and engage with the side of seid armature to prevent the return of the latter after the arinstuie has been moved to its oppositely disposed position.

2. In combination, an electroimwnet, en armature iidziptedto occupy ai.. .po ioii in Contact with. said muguet or spaced therefrom, ine-mis for normally holding;l sind sirius ture in on i of szivifl positions, means` operatively conneetod to the armature for (.losing :i circuit when sii-id armature is in its oppo-A sitely disposed position, and a longitudinally I iiiovahle looking pin normally engaging wit li one edge oi seid armature when the letter in its first .mentioned position and adopted io lie released and prevent the return of 'the-iii*- iiiatlue by the movement of said armature to its oppositely disposed position.

' ii combination, an. electromagnet, mi-

armature. pivotally mounted adjacent theretively connected to seid srniature'for closing a circuit when seid armature is in 'its second position, and a spring pressed longitudinally movable pin normally engaging witnthe edge oi' the armature when the latter is in one position and adopted to engage with one side of the\ armature to prevent the return of the ariiieture when the hitter is in its second position.

4. In combination, :i bese pinto, an electromagnot mounted thereon, on armature movably mounted adjacent said electromagnet, a' casing secured to said bose plato and inclosing seid armature and electroning'net, zuid o longitudinally movable pin carried by siiid casing" and normally engaging with said ernieture.

5i in combination, a hase plate, an electromagnet carried thereby, an armature adjacent seid magnet end adapted to occupy either one of two positions, means for'iioi molly holding said armature in one of said positions, means operatively connected to the armature for closing a circuit when the armature is inthe second position, and a longitudinally'movable spring pressed pin citrried h f said casing and normally engagingl with t e edge of seid armature when it is in' the irs't mentioned position, and adapted to engage with the side of the armature. to prevent its return movement when the arme;- ture ism its second position.

6. in combination, :ibase plete, en elec-y tromagnet mounted thereon, an armature iuiljiicent said magnet and capable of occupying either one of two positions, a casing surrounding said armature sind magnet, and :i longitudinally movable pin extending through sri-id casing and carried thereby, said pio. being normally held in its outermost position when the armature is in one of its two positions and movable into the casing!I to engage with the side of the armature to prevent its return movement when said armature. is in its second position.

nAvni n. iiRinniiAN Vilitnesses:

ABRAHAM P. Fni'nnMAN, Moins Fninniimn.

IOO 

